Preliminary compositor disabling patch.

cc/quads/draw_quad.h

Index: cc/quads/draw_quad.h
diff --git a/cc/quads/draw_quad.h b/cc/quads/draw_quad.h
index 3897d1d1ce87db14bd378719e5e694de726ba427..9ad850205defa93929c557e2c8a6628f41c17138 100644
--- a/cc/quads/draw_quad.h
+++ b/cc/quads/draw_quad.h
@@ -76,6 +76,10 @@ class CC_EXPORT DrawQuad {
   // should be clipped to |rect|. This rect lives in content space.
   gfx::Rect visible_rect;
 
+  // If true, this quad has individual damage and the damage rect is not stored
+  // in RenderPass::damage_rect.
+  bool damaged;
+
   // By default blending is used when some part of the quad is not opaque.
   // With this setting, it is possible to force blending on regardless of the
   // opaque area.